Glossary of Terms in Soil Science

zeta potential

See electrokinetic potential.

zonal soil

Any one of the great groups of soils having well-developed soil characteristics that reflect the zonal influence of climate and living organisms, mainly vegetation, as active factors of soil genesis. The zonal great soil group was the name of a former taxon that was similar to the present Canadian concept of the great group for example Gray Brown Luvisol

zone soil

Area in which the dominant or zonal soils reflect the zonal influence of climate and vegetation, and form a natural land pattern with other soils that exhibit the zonal influence only weakly or not at all. The soil zone is not a taxonomic unit but may be used as a cartographic unit.

zymogenous flora

Organisms found in soils in large numbers immediately after the addition of readily decomposable organic materials.